package com.itheima.web.serlvlet;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


public class BaseServlet extends HttpServlet {
    @Override
    public void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求路径
        String uri = req.getRequestURI();
        //通过分割得到路径的最后的方法名称
        int index = uri.lastIndexOf('/');
        String methodName = uri.substring(index + 1);
        //执行方法
        //System.out.println(this);  谁使用我这个方法我就是谁
        Class<? extends BaseServlet> cls = this.getClass();//通过字节码获取对象 Class
        try {
            Method method = cls.getMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }


    }
}
